The Cisco Catalyst 4500 Series offers three chassis options and four supervisor engine options. It provides a common architecture that scales to 240 ports. The Cisco Catalyst 4507R is the only Cisco Catalyst 4500 Series switch to support 1+1 redundant supervisor engines with sub-minute failover time. Using the same line cards and supervisor engines (Cisco Catalyst Supervisor Engines II and III) as the widely deployed Cisco Catalyst 4000 Series, the Cisco Catalyst 4500 Series enhances the Cisco commitment to affordable enterprise and branch scalability. It provides a cost-effective, flexible network solution that scales to meet today's high-performance needs with investment protection